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首页> 外文期刊>Journal of oceanography >Growth stimulation and inhibition of natural phytoplankton communities by model organic ligands in the western subarctic Pacific
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Growth stimulation and inhibition of natural phytoplankton communities by model organic ligands in the western subarctic Pacific

机译：模型有机配体在西北极太平洋中的生长刺激和对天然浮游植物群落的抑制

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The influence of organic ligands on natural phytoplankton growth was investigated in high-nitrate low-chlorophyll (HNLC) waters and during a phytoplankton bloom induced by a mesoscale iron enrichment experiment (SEEDS II) in the western subarctic Pacific. The growth responses of the phytoplankton in the treatments with iron complexed with model ligand were compared with those with inorganic iron or a control. Desferrioxamine B and protoporphyrin IX were used as models for hydroxamate-type siderophore and tetrapyrrole-type cell breakdown ligand, respectively. In the HNLC water, iron associated with protoporphyrin IX especially stimulated smaller phytoplankton (<10?μm) growth, 1.5-fold more than did inorganic iron. Surprisingly, only the addition of protoporphyrin IX stimulated small phytoplankton growth, suggesting that these cell breakdown ligands might be more bioavailable for them. The protoporphyrin IX’s stimulatory effect on small phytoplankton was not observed during bloom decline phase. The growth of phytoplankton was inhibited in the treatment with desferrioxamine B-complexed iron, suggesting its low bioavailability for the natural phytoplankton community. Its inhibitory effects were particularly pronounced in pico-eukaryotic phytoplankton. During the iron-induced bloom, the phytoplankton’s iron-stress response gradually increased with the desferrioxamine B concentration, suggesting that the competition for iron complexation between natural ligands and desferrioxamine B affected phytoplankton growth. However, the pico-eukaryotes did seem better able to utilize the desferrioxamine B-complexed iron during the bloom-developing phase. These results indicate that the iron bioavailability for phytoplankton differs between bloom-developing and bloom-decline phases.
机译：在北极西北部中尺度铁富集实验（SEEDS II）诱导的高硝酸盐低叶绿素（HNLC）水域和浮游植物开花期间，研究了有机配体对自然浮游植物生长的影响。将铁与模型配体复合处理后的浮游植物的生长反应与无机铁或对照进行了比较。去铁胺B和原卟啉IX分别用作异羟肟酸酯型铁载体和四吡咯型细胞分解配体的模型。在HNLC水中，与原卟啉IX结合的铁特别刺激了较小的浮游植物（<10？μm）生长，是无机铁的1.5倍。出乎意料的是，仅原卟啉IX的加入刺激了浮游植物的小生长，表明这些细胞分解配体可能对它们具有更高的生物利用度。在水华衰落期未观察到原卟啉IX对小型浮游植物的刺激作用。去铁胺B复合铁处理后，浮游植物的生长受到抑制，这表明其对天然浮游植物群落的生物利用度较低。在微核真核浮游植物中，其抑制作用尤为明显。在铁诱导的开花期间，浮游植物的铁应激反应随去铁胺B的浓度而逐渐增加，这表明天然配体与去铁胺B之间铁络合的竞争影响了浮游植物的生长。然而，在真花真核生物的花序发育阶段似乎确实能够更好地利用去铁胺B复合铁。这些结果表明浮游植物的铁生物利用度在花开发育阶段和花开下降阶段之间是不同的。

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